Organic electroluminescent materials and devices

ABSTRACT

Provided are multi-NBN host compounds. The compound has the structure of Formula I:Also provided are formulations comprising these multi-NBN host compounds. Further provided are OLEDs and related consumer products that utilize these multi-NBN host compounds.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119(e) to U.S.Provisional Application No. 62/984,858, filed on Mar. 4, 2020, theentire contents of which are incorporated herein by reference.

FIELD

The present disclosure generally relates to organometallic compounds andformulations and their various uses including as hosts or emitters indevices such as organic light emitting diodes and related electronicdevices.

BACKGROUND

Opto-electronic devices that make use of organic materials are becomingincreasingly desirable for various reasons. Many of the materials usedto make such devices are relatively inexpensive, so organicopto-electronic devices have the potential for cost advantages overinorganic devices. In addition, the inherent properties of organicmaterials, such as their flexibility, may make them well suited forparticular applications such as fabrication on a flexible substrate.Examples of organic opto-electronic devices include organic lightemitting diodes/devices (OLEDs), organic phototransistors, organicphotovoltaic cells, and organic photodetectors. For OLEDs, the organicmaterials may have performance advantages over conventional materials.

OLEDs make use of thin organic films that emit light when voltage isapplied across the device. OLEDs are becoming an increasinglyinteresting technology for use in applications such as flat paneldisplays, illumination, and backlighting.

One application for phosphorescent emissive molecules is a full colordisplay. Industry standards for such a display call for pixels adaptedto emit particular colors, referred to as “saturated” colors. Inparticular, these standards call for saturated red, green, and bluepixels. Alternatively, the OLED can be designed to emit white light. Inconventional liquid crystal displays emission from a white backlight isfiltered using absorption filters to produce red, green and blueemission. The same technique can also be used with OLEDs. The white OLEDcan be either a single emissive layer (EML) device or a stack structure.Color may be measured using CIE coordinates, which are well known to theart.

SUMMARY

Disclosed herein is a new series of high triplet host compounds based on1,3,2-diazaborole or 1,3,2-oxazaborole. Some inventive compounds showvery high calculated T₁ energies. The HOMO and LUMO levels can be tunedby introducing different substituents. The high triplet energy andproper HOMO and LUMO energies are beneficial for achieving highlyefficient deep-blue phosphorescent OLED.

In one aspect, the present disclosure provides a compound having thestructure of Formula I:

wherein: A is a monocyclic or multicyclic ring system comprising one ormore fused or unfused 5-membered or 6-membered carbocyclic orheterocyclic rings which can be further substituted; with the provisothat at least four atoms within A are C, each R independently has astructure of Formula II:

R is fused to two consecutive carbon atoms in A through the dashedlines; Z¹ and Z² are each independently selected from the groupconsisting of O, S, Se, and NAr⁵; Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ are eachindependently a 5-membered or 6-membered carbocyclic or heterocyclicring which can be further substituted; index n is 0, 1, or 2 with theproviso that when 1) Z¹ is NAr⁵, and 2) Ar¹, Ar² and Ar⁵ are all6-membered carbocyclic rings, then n is 1 or 2; or when Z¹ is O, then nis 1 or 2; and any two adjacent A, Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ can bejoined or fused to form a ring.

In one aspect, the present disclosure provides a compound having thestructure of Formula III:

wherein: each X may be the same or different and is C or N; D is amonocyclic or multicyclic ring system comprising one or more fused orunfused 5-membered or 6-membered carbocyclic or heterocyclic rings whichcan be further substituted;R′ comprise a structure of Formula IV:

each X′ may be the same or different and is C or N; R′ is joined to acarbon atom in D through the dashed line; Z³ and Z⁴ are eachindependently selected from the group consisting of O, S, Se, and NAr⁸;R^(A) and R^(B) each independently represent zero, mono to the maximumallowable substitution; each R^(A) and R^(B) is independently a hydrogenor a substituent selected from the group consisting of deuterium,halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof; Ar⁶, Ar⁷, and Ar⁸ are each independently a5-membered or 6-membered carbocyclic or heterocyclic ring which can befurther substituted; index m is 1 or 2; and any two substituents can bejoined or fused to form a ring.

In another aspect, the present disclosure provides a formulation of acompound having the structure of Formula I or Formula III as describedherein.

In yet another aspect, the present disclosure provides an OLED having anorganic layer comprising a formulation of a compound having thestructure of Formula I or Formula III as described herein.

In yet another aspect, the present disclosure provides a consumerproduct comprising an OLED with an organic layer comprising aformulation of a compound having the structure of Formula I or FormulaIII as described herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an organic light emitting device.

FIG. 2 shows an inverted organic light emitting device that does nothave a separate electron transport layer.

DETAILED DESCRIPTION A. Terminology

Unless otherwise specified, the below terms used herein are defined asfollows:

As used herein, the term “organic” includes polymeric materials as wellas small molecule organic materials that may be used to fabricateorganic opto-electronic devices. “Small molecule” refers to any organicmaterial that is not a polymer, and “small molecules” may actually bequite large. Small molecules may include repeat units in somecircumstances. For example, using a long chain alkyl group as asubstituent does not remove a molecule from the “small molecule” class.Small molecules may also be incorporated into polymers, for example as apendent group on a polymer backbone or as a part of the backbone. Smallmolecules may also serve as the core moiety of a dendrimer, whichconsists of a series of chemical shells built on the core moiety. Thecore moiety of a dendrimer may be a fluorescent or phosphorescent smallmolecule emitter. A dendrimer may be a “small molecule,” and it isbelieved that all dendrimers currently used in the field of OLEDs aresmall molecules.

As used herein, “top” means furthest away from the substrate, while“bottom” means closest to the substrate. Where a first layer isdescribed as “disposed over” a second layer, the first layer is disposedfurther away from substrate. There may be other layers between the firstand second layer, unless it is specified that the first layer is “incontact with” the second layer. For example, a cathode may be describedas “disposed over” an anode, even though there are various organiclayers in between.

As used herein, “solution processable” means capable of being dissolved,dispersed, or transported in and/or deposited from a liquid medium,either in solution or suspension form.

A ligand may be referred to as “photoactive” when it is believed thatthe ligand directly contributes to the photoactive properties of anemissive material. A ligand may be referred to as “ancillary” when it isbelieved that the ligand does not contribute to the photoactiveproperties of an emissive material, although an ancillary ligand mayalter the properties of a photoactive ligand.

As used herein, and as would be generally understood by one skilled inthe art, a first “Highest Occupied Molecular Orbital” (HOMO) or “LowestUnoccupied Molecular Orbital” (LUMO) energy level is “greater than” or“higher than” a second HOMO or LUMO energy level if the first energylevel is closer to the vacuum energy level. Since ionization potentials(IP) are measured as a negative energy relative to a vacuum level, ahigher HOMO energy level corresponds to an IP having a smaller absolutevalue (an IP that is less negative). Similarly, a higher LUMO energylevel corresponds to an electron affinity (EA) having a smaller absolutevalue (an EA that is less negative). On a conventional energy leveldiagram, with the vacuum level at the top, the LUMO energy level of amaterial is higher than the HOMO energy level of the same material. A“higher” HOMO or LUMO energy level appears closer to the top of such adiagram than a “lower” HOMO or LUMO energy level.

As used herein, and as would be generally understood by one skilled inthe art, a first work function is “greater than” or “higher than” asecond work function if the first work function has a higher absolutevalue. Because work functions are generally measured as negative numbersrelative to vacuum level, this means that a “higher” work function ismore negative. On a conventional energy level diagram, with the vacuumlevel at the top, a “higher” work function is illustrated as furtheraway from the vacuum level in the downward direction. Thus, thedefinitions of HOMO and LUMO energy levels follow a different conventionthan work functions.

The terms “halo,” “halogen,” and “halide” are used interchangeably andrefer to fluorine, chlorine, bromine, and iodine.

The term “acyl” refers to a substituted carbonyl radical (C(O)—R_(s)).

The term “ester” refers to a substituted oxycarbonyl (—O—C(O)—R_(s) or—C(O)—O—R_(s)) radical.

The term “ether” refers to an —OR_(s) radical.

The terms “sulfanyl” or “thio-ether” are used interchangeably and referto a —SR_(s) radical.

The term “sulfinyl” refers to a —S(O)—R_(s) radical.

The term “sulfonyl” refers to a —SO₂—R_(s) radical.

The term “phosphino” refers to a —P(R_(s))₃ radical, wherein each R_(s)can be same or different.

The term “silyl” refers to a —Si(R_(s))₃ radical, wherein each R_(s) canbe same or different.

The term “boryl” refers to a —B(R_(s))₂ radical or its Lewis adduct—B(R_(s))₃ radical, wherein R_(s) can be same or different.

In each of the above, R_(s) can be hydrogen or a substituent selectedfrom the group consisting of deuterium, halogen, alkyl, cycloalkyl,heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl,alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, andcombination thereof. Preferred R_(s) is selected from the groupconsisting of alkyl, cycloalkyl, aryl, heteroaryl, and combinationthereof.

The term “alkyl” refers to and includes both straight and branched chainalkyl radicals. Preferred alkyl groups are those containing from one tofifteen carbon atoms and includes methyl, ethyl, propyl, 1-methylethyl,butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl,2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl,2,2-dimethylpropyl, and the like. Additionally, the alkyl group can besubstituted.

The term “cycloalkyl” refers to and includes monocyclic, polycyclic, andspiro alkyl radicals. Preferred cycloalkyl groups are those containing 3to 12 ring carbon atoms and includes cyclopropyl, cyclopentyl,cyclohexyl, bicyclo[3.1.1]heptyl, spiro[4.5]decyl, spiro[5.5]undecyl,adamantyl, and the like. Additionally, the cycloalkyl group can besubstituted.

The terms “heteroalkyl” or “heterocycloalkyl” refer to an alkyl or acycloalkyl radical, respectively, having at least one carbon atomreplaced by a heteroatom. Optionally the at least one heteroatom isselected from O, S, N, P, B, Si and Se, preferably, O, S or N.Additionally, the heteroalkyl or heterocycloalkyl group can besubstituted.

The term “alkenyl” refers to and includes both straight and branchedchain alkene radicals. Alkenyl groups are essentially alkyl groups thatinclude at least one carbon-carbon double bond in the alkyl chain.Cycloalkenyl groups are essentially cycloalkyl groups that include atleast one carbon-carbon double bond in the cycloalkyl ring. The term“heteroalkenyl” as used herein refers to an alkenyl radical having atleast one carbon atom replaced by a heteroatom. Optionally the at leastone heteroatom is selected from O, S, N, P, B, Si, and Se, preferably,O, S, or N. Preferred alkenyl, cycloalkenyl, or heteroalkenyl groups arethose containing two to fifteen carbon atoms. Additionally, the alkenyl,cycloalkenyl, or heteroalkenyl group can be substituted.

The term “alkynyl” refers to and includes both straight and branchedchain alkyne radicals. Alkynyl groups are essentially alkyl groups thatinclude at least one carbon-carbon triple bond in the alkyl chain.Preferred alkynyl groups are those containing two to fifteen carbonatoms. Additionally, the alkynyl group can be substituted.

The terms “aralkyl” or “arylalkyl” are used interchangeably and refer toan alkyl group that is substituted with an aryl group. Additionally, thearalkyl group can be substituted.

The term “heterocyclic group” refers to and includes aromatic andnon-aromatic cyclic radicals containing at least one heteroatom.Optionally the at least one heteroatom is selected from O, S, N, P, B,Si, and Se, preferably, O, S, or N. Hetero-aromatic cyclic radicals maybe used interchangeably with heteroaryl. Preferred hetero-non-aromaticcyclic groups are those containing 3 to 7 ring atoms which includes atleast one hetero atom, and includes cyclic amines such as morpholino,piperidino, pyrrolidino, and the like, and cyclic ethers/thio-ethers,such as tetrahydrofuran, tetrahydropyran, tetrahydrothiophene, and thelike. Additionally, the heterocyclic group can be substituted.

The term “aryl” refers to and includes both single-ring aromatichydrocarbyl groups and polycyclic aromatic ring systems. The polycyclicrings may have two or more rings in which two carbons are common to twoadjoining rings (the rings are “fused”) wherein at least one of therings is an aromatic hydrocarbyl group, e.g., the other rings can becycloalkyls, cycloalkenyls, aryl, heterocycles, and/or heteroaryls.Preferred aryl groups are those containing six to thirty carbon atoms,preferably six to twenty carbon atoms, more preferably six to twelvecarbon atoms. Especially preferred is an aryl group having six carbons,ten carbons or twelve carbons. Suitable aryl groups include phenyl,biphenyl, triphenyl, triphenylene, tetraphenylene, naphthalene,anthracene, phenalene, phenanthrene, fluorene, pyrene, chrysene,perylene, and azulene, preferably phenyl, biphenyl, triphenyl,triphenylene, fluorene, and naphthalene. Additionally, the aryl groupcan be substituted.

The term “heteroaryl” refers to and includes both single-ring aromaticgroups and polycyclic aromatic ring systems that include at least oneheteroatom. The heteroatoms include, but are not limited to O, S, N, P,B, Si, and Se. In many instances, O, S, or N are the preferredheteroatoms. Hetero-single ring aromatic systems are preferably singlerings with 5 or 6 ring atoms, and the ring can have from one to sixheteroatoms. The hetero-polycyclic ring systems can have two or morerings in which two atoms are common to two adjoining rings (the ringsare “fused”) wherein at least one of the rings is a heteroaryl, e.g.,the other rings can be cycloalkyls, cycloalkenyls, aryl, heterocycles,and/or heteroaryls. The hetero-polycyclic aromatic ring systems can havefrom one to six heteroatoms per ring of the polycyclic aromatic ringsystem. Preferred heteroaryl groups are those containing three to thirtycarbon atoms, preferably three to twenty carbon atoms, more preferablythree to twelve carbon atoms. Suitable heteroaryl groups includedibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene,benzofuran, benzothiophene, benzoselenophene, carbazole,indolocarbazole, pyridylindole, pyrrolodipyridine, pyrazole, imidazole,triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole,thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine,oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole,indoxazine, benzoxazole, benzisoxazole, benzothiazole, quinoline,isoquinoline, cinnoline, quinazoline, quinoxaline, naphthyridine,phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine,phenoxazine, benzofuropyridine, furodipyridine, benzothienopyridine,thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine,preferably dibenzothiophene, dibenzofuran, dibenzoselenophene,carbazole, indolocarbazole, imidazole, pyridine, triazine,benzimidazole, 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazine,and aza-analogs thereof. Additionally, the heteroaryl group can besubstituted.

Of the aryl and heteroaryl groups listed above, the groups oftriphenylene, naphthalene, anthracene, dibenzothiophene, dibenzofuran,dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine,pyrazine, pyrimidine, triazine, and benzimidazole, and the respectiveaza-analogs of each thereof are of particular interest.

The terms alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aralkyl, heterocyclic group, aryl,and heteroaryl, as used herein, are independently unsubstituted, orindependently substituted, with one or more general substituents.

In many instances, the general substituents are selected from the groupconsisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl,heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylicacid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl,phosphino, boryl, and combinations thereof.

In some instances, the preferred general substituents are selected fromthe group consisting of deuterium, fluorine, alkyl, cycloalkyl,heteroalkyl, alkoxy, aryloxy, amino, silyl, boryl, alkenyl,cycloalkenyl, heteroalkenyl, aryl, heteroaryl, nitrile, isonitrile,sulfanyl, boryl, and combinations thereof.

In some instances, the more preferred general substituents are selectedfrom the group consisting of deuterium, fluorine, alkyl, cycloalkyl,alkoxy, aryloxy, amino, silyl, boryl, aryl, heteroaryl, sulfanyl, andcombinations thereof.

In yet other instances, the most preferred general substituents areselected from the group consisting of deuterium, fluorine, alkyl,cycloalkyl, aryl, heteroaryl, and combinations thereof.

The terms “substituted” and “substitution” refer to a substituent otherthan H that is bonded to the relevant position, e.g., a carbon ornitrogen. For example, when IV represents mono-substitution, then one IVmust be other than H (i.e., a substitution). Similarly, when IVrepresents di-substitution, then two of IV must be other than H.Similarly, when IV represents zero or no substitution, R′, for example,can be a hydrogen for available valencies of ring atoms, as in carbonatoms for benzene and the nitrogen atom in pyrrole, or simply representsnothing for ring atoms with fully filled valencies, e.g., the nitrogenatom in pyridine. The maximum number of substitutions possible in a ringstructure will depend on the total number of available valencies in thering atoms.

As used herein, “combinations thereof” indicates that one or moremembers of the applicable list are combined to form a known orchemically stable arrangement that one of ordinary skill in the art canenvision from the applicable list. For example, an alkyl and deuteriumcan be combined to form a partial or fully deuterated alkyl group; ahalogen and alkyl can be combined to form a halogenated alkylsubstituent; and a halogen, alkyl, and aryl can be combined to form ahalogenated arylalkyl. In one instance, the term substitution includes acombination of two to four of the listed groups. In another instance,the term substitution includes a combination of two to three groups. Inyet another instance, the term substitution includes a combination oftwo groups. Preferred combinations of substituent groups are those thatcontain up to fifty atoms that are not hydrogen or deuterium, or thosewhich include up to forty atoms that are not hydrogen or deuterium, orthose that include up to thirty atoms that are not hydrogen ordeuterium. In many instances, a preferred combination of substituentgroups will include up to twenty atoms that are not hydrogen ordeuterium.

The “aza” designation in the fragments described herein, i.e.aza-dibenzofuran, aza-dibenzothiophene, etc. means that one or more ofthe C−H groups in the respective aromatic ring can be replaced by anitrogen atom, for example, and without any limitation, azatriphenyleneencompasses both dibenzo[f,h]quinoxaline and dibenzo[f,h]quinoline. Oneof ordinary skill in the art can readily envision other nitrogen analogsof the aza-derivatives described above, and all such analogs areintended to be encompassed by the terms as set forth herein.

As used herein, “deuterium” refers to an isotope of hydrogen. Deuteratedcompounds can be readily prepared using methods known in the art. Forexample, U.S. Pat. No. 8,557,400, Patent Pub. No. WO 2006/095951, andU.S. Pat. Application Pub. No. US 2011/0037057, which are herebyincorporated by reference in their entireties, describe the making ofdeuterium-substituted organometallic complexes. Further reference ismade to Ming Yan, et al., Tetrahedron 2015, 71, 1425-30 and Atzrodt etal., Angew. Chem. Int. Ed. (Reviews) 2007, 46, 7744-65, which areincorporated by reference in their entireties, describe the deuterationof the methylene hydrogens in benzyl amines and efficient pathways toreplace aromatic ring hydrogens with deuterium, respectively.

It is to be understood that when a molecular fragment is described asbeing a substituent or otherwise attached to another moiety, its namemay be written as if it were a fragment (e.g. phenyl, phenylene,naphthyl, dibenzofuryl) or as if it were the whole molecule (e.g.benzene, naphthalene, dibenzofuran). As used herein, these differentways of designating a substituent or attached fragment are considered tobe equivalent.

In some instance, a pair of adjacent substituents can be joined or fusedinto a ring. The preferred ring is a five, six, or seven-memberedcarbocyclic or heterocyclic ring, includes both instances where theportion of the ring formed by the pair of substituents is saturated andwhere the portion of the ring formed by the pair of substituents isunsaturated. As used herein, “adjacent” means that the two substituentsinvolved can be on the same ring next to each other, or on twoneighboring rings having the two closest available substitutablepositions, such as 2, 2′ positions in a biphenyl, or 1, 8 position in anaphthalene, as long as they can form a stable fused ring system.

B. The Compounds of the Present Disclosure

In one aspect, the present disclosure provides a compound having thestructure of Formula I:

wherein: A is a monocyclic or multicyclic ring system comprising one ormore fused or unfused 5-membered or 6-membered carbocyclic orheterocyclic rings which can be further substituted, with the provisothat at least four atoms within A are C; each R independently has astructure of Formula II:

R is fused to two consecutive carbon atoms in A through the dashedlines; Z¹ and Z² are each independently selected from the groupconsisting of O, S, Se, and NAr⁵; Ar², Ar³, Ar⁴, and Ar⁵ are eachindependently a 5-membered or 6-membered carbocyclic or heterocyclicring which can be further substituted; index n is 0, 1, or 2; with theproviso that when 1) Z¹ is NAr⁵, and 2) Ar¹, Ar² and Ar⁵ are all6-membered carbocyclic rings, then n is 1 or 2; or when Z¹ is O, then nis 1 or 2; and any two adjacent A, Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ can bejoined or fused to form a ring.

In some embodiments, A is a 6-membered ring.

In some embodiments, A is an aromatic ring. In some embodiments, A isaryl. In some embodiments, A is heteroaryl. In some embodiments, theheteroaryl is selected from the group consisting of pyridine,pyrimidine, triazine, pyridazine, pyrazine, benzene, imidazole,pyrazole, oxazole, thiazole, and N-heterocycliccarbene.

In some embodiments, A comprises at least two fused rings.

In some embodiments, A comprises at least three fused rings.

In some embodiments, A comprises at least four fused rings. The at leasttwo, three or four fused rings in A do not include the fused R.

In some embodiments, A comprises the general substituents or thepreferred general substituents disclosed above described herein.

In some embodiments, each ring in A is a 6-membered ring.

In some embodiments, Z¹ and Z² are each independently selected from thegroup consisting of O and NAr⁵.

In some embodiments, Ar¹ and Ar² are each independently 6-memberedaromatic rings.

In some embodiments, Ar³ and Ar⁴ are each independently 6-memberedaromatic rings.

In some embodiments, Ar⁵ is a 6-membered aromatic ring.

In some embodiments, n is 0.

In some embodiments, n is 1.

In some embodiments, n is 2.

In some embodiments, the compound is selected from the group consistingof:

-   -   wherein R^(1′), R^(2′), R^(3′), R^(4′) and R^(5′) are each        independently selected from the general substituents described        herein.

In some embodiments, the compound is selected from the group consistingof:

Compound name Structure CompoundI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein wherein i is an integerfrom 1 to 65 Compound I-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] and j, k,1, m are independently an to Compound I-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)]integer from 1 to 60 having the structure

Compound II-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein wherein i isan integer from 1 to 65 CompoundII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to and j, k, 1, m areindependently an Compound II-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound III-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein wherein i isan integer from 1 to 65 CompoundIII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to and j, k, l, m areindependently an Compound III-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound IV- [(R^(i))(R^(j))(R^(k))], wherein i wherein CompoundIV-[(R^(l))(R^(l))(R^(l))] is an integer from 1 to 65 and j and k toCompound IV-[(R⁶⁵)(R⁶⁰)(R⁶⁰)] are independently an integer from 1 to 60having the structure

Compound V-[(R^(i))(R^(j))(R^(k))],wherein i wherein CompoundV-[(R^(l))(R^(l))(R^(l))] is an integer from 1 to 65 and j and k toCompound V-[(R⁶⁵)(R⁶⁰)(R⁶⁰)] are independently an integer from 1 to 60having the structure

Compound VI-[(R^(i))(R^(j))(R^(k))],wherein i wherein CompoundVI-[(R^(l))(R^(l))(R^(l))] is an integer from 1 to 65 and j and k toCompound V-[(R⁶⁵)(R⁶⁰)(R⁶⁰)] are independently an integer from 1 to 60having the structure

Compound VII-[(R^(i))(R^(j))(R^(k))],wherein i wherein CompoundVII-[(R^(i))(R^(i))(R^(i))] is an integer from 1 to 65 and j and k toCompound V-[(R⁶⁵)(R⁶⁰)(R⁶⁰)] are independently an integer from 1 to 60having the structure

Compound VIII-[(R^(i))(R^(j))(R^(k))(R^(l))], wherein Compound VIII-wherein i is an integer from 1 to 65 [(R^(l))(R^(l))(R^(l))(R^(l))] toand j, k, l are independently an integer CompoundVIII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)] from 1 to 60 having the structure

Compound IX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65IX-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an X-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound X-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65X-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an X-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XI-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XI-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XIII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XIII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, mare independently an XIII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to60 having the structure

Compound XIV-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XIV-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XIV-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XV-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XV-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XV-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XVI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XVI-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XVI-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XVII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XVII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, mare independently an XVII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integerfrom 1 to60 having the structure

Compound XVIII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XVIII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, mare independently an XVIII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integerfrom 1 to60 having the structure

Compound XIX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XIX-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XIX-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XX-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XX-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XXI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XXI-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, m areindependently an XXI-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to 60having the structure

Compound XXII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein Compoundwherein i is an integer from 1 to 65XXII-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))] to Compound and j, k, l, mare independently an XXII-[(R⁶⁵)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to60 having the structure

where R₁ to R⁶⁵ have the following structures:

In some embodiments, the compound is selected from the group consistingof:

wherein R⁶⁶ is selected from the group consisting of

and R⁶⁷ is S or O.

In some embodiments, the present disclosure provides a compound havingthe structure of Formula III:

wherein: each X may be the same or different and is C or N; D is amonocyclic or multicyclic ring system comprising one or more fused orunfused 5-membered or 6-membered carbocyclic or heterocyclic rings whichcan be further substituted;R′ comprise a structure of Formula IV:

each X′ may be the same or different and is C or N; R′ is joined to acarbon atom in D through the dashed line; Z³ and Z⁴ are eachindependently selected from the group consisting of O, S, Se, and NAr⁸;R^(A) and R^(B) each independently represents zero, mono to the maximumallowable substitution; each R^(A) and R^(B) is independently a hydrogenor a substituent selected from the group consisting of the generalsubstituents described herein; Ar⁶, Ar⁷, and Ar⁸ are each independentlya 5-membered or 6-membered carbocyclic or heterocyclic ring which can befurther substituted; index m is 1 or 2; and any two adjacent R^(A),R^(B), Ar⁶, Ar⁷, and Ar⁸ can be joined or fused to form a ring.

In some embodiments, each R^(A) and R^(B) independently a hydrogen or asubstituent selected from the group consisting of the preferred generalsubstituents disclosed above described herein.

In some embodiments, each X is C.

In some embodiments, each X′ is C.

In some embodiments, D comprises a single ring.

In some embodiments, D comprises two fused rings.

In some embodiments, D comprises three fused rings.

In some embodiments, D comprises the general substituents describedherein.

In some embodiments, D comprises dibenzofuran, dibenzothiophene, orcarbazole.

In some embodiments, Z³ and Z⁴ are each independently selected from thegroup consisting of O, S, and NAr⁸.

In some embodiments, Ar⁶ is a 6-membered aromatic ring.

In some embodiments, Ar⁷ is a 6-membered aromatic ring.

In some embodiments, Ar⁸ is a 6-membered aromatic ring.

In some embodiments, m is 1.

In some embodiments, m is 2.

In some embodiments, the compound is selected from the group consistingof:

wherein R^(1″), R^(2″), R^(3″), R^(4″), R^(5″) and R^(6″) are eachindependently selected from the general substituents described herein.

In some embodiments, the compound is selected from the group consistingof:

Compound name Structure Compound I′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))],wherein Compound I′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′,l′ are independently an to Compound I′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integerfrom 1 to 60 having the structure

Compound II′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound II′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound III′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundIII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound III′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound IV′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundIV′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound IV′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound V′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundV′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound V′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to60 having the structure

Compound VI′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundVI′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound VI′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound VII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundVII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound VII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound VIII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundVIII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound VIII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound IX′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundIX′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound IX′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound X′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundX′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound X′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1 to60 having the structure

Compound XI′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXI′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XI′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XIII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXIII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XIII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XIV′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXIV′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XIV′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XV′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXV′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XV′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XVI′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXVI′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XVI′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XVII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXVII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XVII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from 1to 60 having the structure

Compound XVIII′-[(R^(i′))(R^(j′))(R^(k′))(R^(l′))], wherein CompoundXVIII′-[(R^(l))(R^(l))(R^(l))(R^(l))] wherein i′, j′, k′, l′areindependently an to Compound XVIII′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)] integer from1 to 60 having the structure

Compound XIX′- wherein CompoundXIX′-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))][(R^(i′))(R^(j′))(R^(k′))(R^(l′))(R^(m′))(R^(n′))], to Compound whereini′, j′, k′, l′are independently an XIX′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)]integer from 1 to 60 having the structure

Compound XX′- wherein CompoundXX′-[(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))(R^(l))][(R^(i′))(R^(j′))(R^(k′))(R^(l′))(R^(m′))(R^(n′))], to Compound whereini′, j′, k′, l′are independently an XX′-[(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)(R⁶⁰)]integer from 1 to 60 having the structure

In some embodiments, the compound is selected from the group consistingof

wherein R⁶⁷ is S or O, and R⁶⁸ is selected from the group consisting of

C. The OLEDs and the Devices of the Present Disclosure

In another aspect, the present disclosure also provides an OLED devicecomprising a first organic layer that contains a compound as disclosedin the above compounds section of the present disclosure.

In some embodiments, the first organic layer may comprise an organiclight emitting device (OLED) comprising: an anode; a cathode; and anorganic layer disposed between the anode and the cathode, wherein theorganic layer comprises a compound of Formula I:

wherein: A is a monocyclic or multicyclic ring system comprising one ormore fused or unfused 5-membered or 6-membered carbocyclic orheterocyclic rings which can be further substituted with the provisothat at least four atoms within A are C; each R independently has astructure of Formula II:

R is fused to two consecutive carbon atoms in A through the dashedlines; Z¹ and Z² are each independently selected from the groupconsisting of O, S, Se, and NAr⁵; Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ are eachindependently a 5-membered or 6-membered carbocyclic or heterocyclicring which can be further substituted; index n is 0, 1, or 2, with theproviso that when 1) Z¹ is NAr⁵, and 2) Ar¹, Ar² and Ar⁵ are all6-membered carbocyclic rings, then n is 1 or 2; or when Z¹ is 0, the nis 1 or 2; and any two adjacent A, Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ can bejoined or fused to form a ring.

In some embodiments, A is a 6-membered ring.

In some embodiments, A is an aromatic ring.

In some embodiments, A comprises at least two fused rings.

In some embodiments, A comprises at least three fused rings.

In some embodiments, A comprises at least four fused rings. The at leasttwo, three or four fused rings in A do not include the fused R.

In some embodiments, A comprises the general substituents or thepreferred general substituents disclosed above.

In some embodiments, each ring in A is a 6-membered ring.

In some embodiments, Z¹ and Z² are each independently selected from thegroup consisting of O and NAr⁵.

In some embodiments, Ar₁ and Ar² are each independently 6-memberedaromatic rings.

In some embodiments, Ar³ and Ar⁴ are each independently 6-memberedaromatic rings.

In some embodiments, Ar⁵ is a 6-membered aromatic ring.

In some embodiments, n is 0.

In some embodiments, n is 1.

In some embodiments, n is 2.

In some embodiments, the compound is selected from the group consistingof:

wherein R⁷, R⁸ and R⁹ are each independently selected from the generalsubstituents described herein.

In some embodiments, the compound is selected from the group consistingof:

Compound name Structure Compound I″-[(R^(i)″)(R^(j)″)(R^(k)″)], whereini″ is an integer from 1 to 65 and j″, k″ are independently an integerfrom 1 to 60

Compound II″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from 1to 65 and j″, k″ are independently an integer from 1 to 60

Compound III″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound IV″-[(R^(i)″)(R^(j)″)], wherein i″ is an integer from 1 to 65and j″ is an integer from 1 to 60

Compound V″-[(R^(i)″)(R^(j)″)], wherein i″ is an integer from 1 to 65and j″ is an integer from 1 to 60

Compound VI″-[(R^(i)″)(R^(j)″)], wherein i″ is an integer from 1 to 65and j″ is an integer from 1 to 60

Compound VII″-[(R^(i)″)(R^(j)″)], wherein i″ is an integer from 1 to 65and j″ is an integer from 1 to 60

Compound VIII″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound IX″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from 1to 65 and j″, k″ are independently an integer from 1 to 60

Compound X″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from 1to 65 and j″, k″ are independently an integer from 1 to 60

Compound XI″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from 1to 65 and j″, k″ are independently an integer from 1 to 60

Compound XII″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound XIII″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound XIV″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound XV″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from 1to 65 and j″, k″ are independently an integer from 1 to 60

Compound XVI″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

Compound XVII″-[(R^(i)″)(R^(j)″)(R^(k)″)], wherein i″ is an integer from1 to 65 and j″, k″ are independently an integer from 1 to 60

In some embodiments, the compound is selected from the group consistingof:

wherein R⁶⁶ is selected from the group consisting of

R⁶⁷ is S or O, and

R⁶⁸ is selected from the group consisting of

In some embodiments, the first organic layer may comprise an organiclight emitting device (OLED) comprising: an anode; a cathode; and anorganic layer disposed between the anode and the cathode, wherein theorganic layer comprises the compound of Formula III disclosed herein.

In some embodiments, the compound is an acceptor, and the OLED furthercomprises a sensitizer selected from the group consisting of a delayedfluorescence emitter, a phosphorescent emitter, and combination thereof.

In some embodiments, the compound is a fluorescent emitter, a delayedfluorescence emitter, or a component of an exciplex that is afluorescent emitter or a delayed fluorescence emitter.

In some embodiments, the compound is a sensitizer, and the OLED furthercomprises an acceptor selected from the group consisting of afluorescent emitter, a delayed fluorescence emitter, and combinationthereof.

In some embodiments, the organic layer further comprises a host, whereinthe host comprises at least one chemical moiety selected from the groupconsisting of naphthalene, fluorene, triphenylene, carbazole,indolocarbazole, dibenzothiphene, dibenzofuran, dibenzoselenophene,5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene, and aza variants thereof.

In some embodiments, the first organic layer may be an emissive layerand the compound as described herein may be an emissive dopant or anon-emissive dopant.

In some embodiments, the compound may be a fluorescent emitter.

In some embodiments, the first organic layer may further comprise aphosphorescent sensitizer, and the compound is a fluorescent acceptor.

In some embodiments, the OLED may comprise a second organic layerdisposed between the anode and the cathode, wherein the second organiclayer comprises a phosphorescent sensitizer, and the compound is afluorescent acceptor.

In some embodiments, the phosphorescent sensitizer may be a transitionmetal complex having at least one ligand or part of the ligand if theligand is more than bidentate selected from the group consisting of:

wherein T is selected from the group consisting of B, Al, Ga, and In;each Y¹ to Y¹³ are independently selected from the group consisting ofcarbon and nitrogen; Y′ is selected from the group consisting of BR_(e),NR_(e), PR_(e), O, S, Se, C═O, S═O, SO₂, CR_(e)R_(f), SiR_(e)R_(f), andGeR_(e)R_(f); R_(e) and R_(f) can be fused or joined to form a ring;each R_(a), R_(b), R_(c), and R_(d) independently represent from zero,mono, or up to a maximum allowed substitution to its associated ring;R_(a), R_(b), R_(c), R_(d), R_(e) and R_(f) are each independentlyhydrogen or a substituent selected from the group consisting ofdeuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy,aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl,aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinationsthereof; and two adjacent substituents of R_(a), R_(b), R_(c), and R_(d)can be fused or joined to form a ring or form a multidentate ligand.

In some embodiments, one or more organic layers, disposed between theanode and cathode, comprise a host, wherein the host comprises at leastone chemical group selected from the group consisting of anthracene,naphthalene, triphenylene, carbazole, dibenzothiphene, dibenzofuran,dibenzoselenophene, azatriphenylene, azacarbazole, aza-dibenzothiophene,aza-dibenzofuran, and aza-dibenzoselenophene.

In some embodiments, the host may be selected from the HOST Groupconsisting of:

and combinations thereof.

In yet another aspect, the OLED of the present disclosure may alsocomprise an emissive region containing a compound as disclosed in theabove compounds section of the present disclosure.

In some embodiments, the emissive region may comprise a compound havingthe structure of Formula I or Formula III as described herein.

In yet another aspect, the present disclosure also provides a consumerproduct comprising an organic light-emitting device (OLED) having ananode; a cathode; and an organic layer disposed between the anode andthe cathode, wherein the organic layer may comprise a compound asdisclosed in the above compounds section of the present disclosure.

In some embodiments, the consumer product comprises an organiclight-emitting device (OLED) having an anode; a cathode; and an organiclayer disposed between the anode and the cathode, wherein the organiclayer may comprise a compound having the structure of Formula I orFormula III as described herein.

In some embodiments, the consumer product can be one of a flat paneldisplay, a computer monitor, a medical monitor, a television, abillboard, a light for interior or exterior illumination and/orsignaling, a heads-up display, a fully or partially transparent display,a flexible display, a laser printer, a telephone, a cell phone, tablet,a phablet, a personal digital assistant (PDA), a wearable device, alaptop computer, a digital camera, a camcorder, a viewfinder, amicro-display that is less than 2 inches diagonal, a 3-D display, avirtual reality or augmented reality display, a vehicle, a video wallcomprising multiple displays tiled together, a theater or stadiumscreen, a light therapy device, and a sign.

Generally, an OLED comprises at least one organic layer disposed betweenand electrically connected to an anode and a cathode. When a current isapplied, the anode injects holes and the cathode injects electrons intothe organic layer(s). The injected holes and electrons each migratetoward the oppositely charged electrode. When an electron and holelocalize on the same molecule, an “exciton,” which is a localizedelectron-hole pair having an excited energy state, is formed. Light isemitted when the exciton relaxes via a photoemissive mechanism. In somecases, the exciton may be localized on an excimer or an exciplex.Non-radiative mechanisms, such as thermal relaxation, may also occur,but are generally considered undesirable.

Several OLED materials and configurations are described in U.S. Pat.Nos. 5,844,363, 6,303,238, and 5,707,745, which are incorporated hereinby reference in their entirety.

The initial OLEDs used emissive molecules that emitted light from theirsinglet states (“fluorescence”) as disclosed, for example, in U.S. Pat.No. 4,769,292, which is incorporated by reference in its entirety.Fluorescent emission generally occurs in a time frame of less than 10nanoseconds.

More recently, OLEDs having emissive materials that emit light fromtriplet states (“phosphorescence”) have been demonstrated. Baldo et al.,“Highly Efficient Phosphorescent Emission from OrganicElectroluminescent Devices,” Nature, vol. 395, 151-154, 1998;(“Baldo-I”) and Baldo et al., “Very high-efficiency green organiclight-emitting devices based on electrophosphorescence,” Appl. Phys.Lett., vol. 75, No. 3, 4-6 (1999) (“Baldo-II”), are incorporated byreference in their entireties. Phosphorescence is described in moredetail in U.S. Pat. No. 7,279,704 at cols. 5-6, which are incorporatedby reference.

FIG. 1 shows an organic light emitting device 100. The figures are notnecessarily drawn to scale. Device 100 may include a substrate 110, ananode 115, a hole injection layer 120, a hole transport layer 125, anelectron blocking layer 130, an emissive layer 135, a hole blockinglayer 140, an electron transport layer 145, an electron injection layer150, a protective layer 155, a cathode 160, and a barrier layer 170.Cathode 160 is a compound cathode having a first conductive layer 162and a second conductive layer 164. Device 100 may be fabricated bydepositing the layers described, in order. The properties and functionsof these various layers, as well as example materials, are described inmore detail in U.S. Pat. No. 7,279,704 at cols. 6-10, which areincorporated by reference.

More examples for each of these layers are available. For example, aflexible and transparent substrate-anode combination is disclosed inU.S. Pat. No. 5,844,363, which is incorporated by reference in itsentirety. An example of a p-doped hole transport layer is m-MTDATA dopedwith F4-TCNQ at a molar ratio of 50:1, as disclosed in U.S. PatentApplication Publication No. 2003/0230980, which is incorporated byreference in its entirety. Examples of emissive and host materials aredisclosed in U.S. Pat. No. 6,303,238 to Thompson et al., which isincorporated by reference in its entirety. An example of an n-dopedelectron transport layer is BPhen doped with Li at a molar ratio of 1:1,as disclosed in U.S. Patent Application Publication No. 2003/0230980,which is incorporated by reference in its entirety. U.S. Pat. Nos.5,703,436 and 5,707,745, which are incorporated by reference in theirentireties, disclose examples of cathodes including compound cathodeshaving a thin layer of metal such as Mg:Ag with an overlyingtransparent, electrically-conductive, sputter-deposited ITO layer. Thetheory and use of blocking layers is described in more detail in U.S.Pat. No. 6,097,147 and U.S. Patent Application Publication No.2003/0230980, which are incorporated by reference in their entireties.Examples of injection layers are provided in U.S. Patent ApplicationPublication No. 2004/0174116, which is incorporated by reference in itsentirety. A description of protective layers may be found in U.S. PatentApplication Publication No. 2004/0174116, which is incorporated byreference in its entirety.

FIG. 2 shows an inverted OLED 200. The device includes a substrate 210,a cathode 215, an emissive layer 220, a hole transport layer 225, and ananode 230. Device 200 may be fabricated by depositing the layersdescribed, in order. Because the most common OLED configuration has acathode disposed over the anode, and device 200 has cathode 215 disposedunder anode 230, device 200 may be referred to as an “inverted” OLED.Materials similar to those described with respect to device 100 may beused in the corresponding layers of device 200. FIG. 2 provides oneexample of how some layers may be omitted from the structure of device100.

The simple layered structure illustrated in FIGS. 1 and 2 is provided byway of non-limiting example, and it is understood that embodiments ofthe present disclosure may be used in connection with a wide variety ofother structures. The specific materials and structures described areexemplary in nature, and other materials and structures may be used.Functional OLEDs may be achieved by combining the various layersdescribed in different ways, or layers may be omitted entirely, based ondesign, performance, and cost factors. Other layers not specificallydescribed may also be included. Materials other than those specificallydescribed may be used. Although many of the examples provided hereindescribe various layers as comprising a single material, it isunderstood that combinations of materials, such as a mixture of host anddopant, or more generally a mixture, may be used. Also, the layers mayhave various sublayers. The names given to the various layers herein arenot intended to be strictly limiting. For example, in device 200, holetransport layer 225 transports holes and injects holes into emissivelayer 220, and may be described as a hole transport layer or a holeinjection layer. In one embodiment, an OLED may be described as havingan “organic layer” disposed between a cathode and an anode. This organiclayer may comprise a single layer, or may further comprise multiplelayers of different organic materials as described, for example, withrespect to FIGS. 1 and 2.

Structures and materials not specifically described may also be used,such as OLEDs comprised of polymeric materials (PLEDs) such as disclosedin U.S. Pat. No. 5,247,190 to Friend et al., which is incorporated byreference in its entirety. By way of further example, OLEDs having asingle organic layer may be used. OLEDs may be stacked, for example asdescribed in U.S. Pat. No. 5,707,745 to Forrest et al, which isincorporated by reference in its entirety. The OLED structure maydeviate from the simple layered structure illustrated in FIGS. 1 and 2.For example, the substrate may include an angled reflective surface toimprove out-coupling, such as a mesa structure as described in U.S. Pat.No. 6,091,195 to Forrest et al., and/or a pit structure as described inU.S. Pat. No. 5,834,893 to Bulovic et al., which are incorporated byreference in their entireties.

Unless otherwise specified, any of the layers of the various embodimentsmay be deposited by any suitable method. For the organic layers,preferred methods include thermal evaporation, ink-jet, such asdescribed in U.S. Pat. Nos. 6,013,982 and 6,087,196, which areincorporated by reference in their entireties, organic vapor phasedeposition (OVPD), such as described in U.S. Pat. No. 6,337,102 toForrest et al., which is incorporated by reference in its entirety, anddeposition by organic vapor jet printing (OVJP), such as described inU.S. Pat. No. 7,431,968, which is incorporated by reference in itsentirety. Other suitable deposition methods include spin coating andother solution based processes. Solution based processes are preferablycarried out in nitrogen or an inert atmosphere. For the other layers,preferred methods include thermal evaporation. Preferred patterningmethods include deposition through a mask, cold welding such asdescribed in U.S. Pat. Nos. 6,294,398 and 6,468,819, which areincorporated by reference in their entireties, and patterning associatedwith some of the deposition methods such as ink-jet and organic vaporjet printing (OVJP). Other methods may also be used. The materials to bedeposited may be modified to make them compatible with a particulardeposition method. For example, substituents such as alkyl and arylgroups, branched or unbranched, and preferably containing at least 3carbons, may be used in small molecules to enhance their ability toundergo solution processing. Substituents having 20 carbons or more maybe used, and 3-20 carbons are a preferred range. Materials withasymmetric structures may have better solution processability than thosehaving symmetric structures, because asymmetric materials may have alower tendency to recrystallize. Dendrimer substituents may be used toenhance the ability of small molecules to undergo solution processing.

Devices fabricated in accordance with embodiments of the presentdisclosure may further optionally comprise a barrier layer. One purposeof the barrier layer is to protect the electrodes and organic layersfrom damaging exposure to harmful species in the environment includingmoisture, vapor and/or gases, etc. The barrier layer may be depositedover, under or next to a substrate, an electrode, or over any otherparts of a device including an edge. The barrier layer may comprise asingle layer, or multiple layers. The barrier layer may be formed byvarious known chemical vapor deposition techniques and may includecompositions having a single phase as well as compositions havingmultiple phases. Any suitable material or combination of materials maybe used for the barrier layer. The barrier layer may incorporate aninorganic or an organic compound or both. The preferred barrier layercomprises a mixture of a polymeric material and a non-polymeric materialas described in U.S. Pat. No. 7,968,146, PCT Pat. Application Nos.PCT/US2007/023098 and PCT/US2009/042829, which are herein incorporatedby reference in their entireties. To be considered a “mixture”, theaforesaid polymeric and non-polymeric materials comprising the barrierlayer should be deposited under the same reaction conditions and/or atthe same time. The weight ratio of polymeric to non-polymeric materialmay be in the range of 95:5 to 5:95. The polymeric material and thenon-polymeric material may be created from the same precursor material.In one example, the mixture of a polymeric material and a non-polymericmaterial consists essentially of polymeric silicon and inorganicsilicon.

Devices fabricated in accordance with embodiments of the presentdisclosure can be incorporated into a wide variety of electroniccomponent modules (or units) that can be incorporated into a variety ofelectronic products or intermediate components. Examples of suchelectronic products or intermediate components include display screens,lighting devices such as discrete light source devices or lightingpanels, etc. that can be utilized by the end-user product manufacturers.Such electronic component modules can be include the driving electronicsand/or power source(s). Devices fabricated in accordance withembodiments of the present disclosure can be incorporated into a widevariety of consumer products that have one or more of the electroniccomponent modules (or units) incorporated therein. A consumer productcomprising an OLED that includes the compound of the present disclosurein the organic layer in the OLED is disclosed. Such consumer productswould include any kind of products that include one or more lightsource(s) and/or one or more of some type of visual displays. Someexamples of such consumer products include flat panel displays, curveddisplays, computer monitors, medical monitors, televisions, billboards,lights for interior or exterior illumination and/or signaling, heads-updisplays, fully or partially transparent displays, flexible displays,rollable displays, foldable displays, stretchable displays, laserprinters, telephones, mobile phones, tablets, phablets, personal digitalassistants (PDAs), wearable devices, laptop computers, digital cameras,camcorders, viewfinders, micro-displays (displays that are less than 2inches diagonal), 3-D displays, virtual reality or augmented realitydisplays, vehicles, video walls comprising multiple displays tiledtogether, theater or stadium screen, a light therapy device, and a sign.Various control mechanisms may be used to control devices fabricated inaccordance with the present disclosure, including passive matrix andactive matrix. Many of the devices are intended for use in a temperaturerange comfortable to humans, such as 18° C. to 30° C., and morepreferably at room temperature (20-25° C.), but could be used outsidethis temperature range, for example, from −40° C. to +80° C.

More details on OLEDs, and the definitions described above, can be foundin U.S. Pat. No. 7,279,704, which is incorporated herein by reference inits entirety.

The materials and structures described herein may have applications indevices other than OLEDs. For example, other optoelectronic devices suchas organic solar cells and organic photodetectors may employ thematerials and structures. More generally, organic devices, such asorganic transistors, may employ the materials and structures.

In some embodiments, the OLED has one or more characteristics selectedfrom the group consisting of being flexible, being rollable, beingfoldable, being stretchable, and being curved. In some embodiments, theOLED is transparent or semi-transparent. In some embodiments, the OLEDfurther comprises a layer comprising carbon nanotubes.

In some embodiments, the OLED further comprises a layer comprising adelayed fluorescent emitter. In some embodiments, the OLED comprises aRGB pixel arrangement or white plus color filter pixel arrangement. Insome embodiments, the OLED is a mobile device, a hand held device, or awearable device. In some embodiments, the OLED is a display panel havingless than 10 inch diagonal or 50 square inch area. In some embodiments,the OLED is a display panel having at least 10 inch diagonal or 50square inch area. In some embodiments, the OLED is a lighting panel.

In some embodiments, the compound can be an emissive dopant. In someembodiments, the compound can produce emissions via phosphorescence,fluorescence, thermally activated delayed fluorescence, i.e., TADF (alsoreferred to as E-type delayed fluorescence; see, e.g., U.S. applicationSer. No. 15/700,352, which is hereby incorporated by reference in itsentirety), triplet-triplet annihilation, or combinations of theseprocesses. In some embodiments, the emissive dopant can be a racemicmixture, or can be enriched in one enantiomer. In some embodiments, thecompound can be homoleptic (each ligand is the same). In someembodiments, the compound can be heteroleptic (at least one ligand isdifferent from others). When there are more than one ligand coordinatedto a metal, the ligands can all be the same in some embodiments. In someother embodiments, at least one ligand is different from the otherligands. In some embodiments, every ligand can be different from eachother. This is also true in embodiments where a ligand being coordinatedto a metal can be linked with other ligands being coordinated to thatmetal to form a tridentate, tetradentate, pentadentate, or hexadentateligands. Thus, where the coordinating ligands are being linked together,all of the ligands can be the same in some embodiments, and at least oneof the ligands being linked can be different from the other ligand(s) insome other embodiments.

In some embodiments, the compound can be used as one component of anexciplex to be used as a sensitizer.

In some embodiments, the sensitizer is a single component, or one of thecomponents to form an exciplex.

According to another aspect, a formulation comprising the compounddescribed herein is also disclosed.

The OLED disclosed herein can be incorporated into one or more of aconsumer product, an electronic component module, and a lighting panel.The organic layer can be an emissive layer and the compound can be anemissive dopant in some embodiments, while the compound can be anon-emissive dopant in other embodiments.

In yet another aspect of the present disclosure, a formulation thatcomprises the novel compound disclosed herein is described. Theformulation can include one or more components selected from the groupconsisting of a solvent, a host, a hole injection material, holetransport material, electron blocking material, hole blocking material,and an electron transport material, disclosed herein.

The present disclosure encompasses any chemical structure comprising thenovel compound of the present disclosure, or a monovalent or polyvalentvariant thereof. In other words, the inventive compound, or a monovalentor polyvalent variant thereof, can be a part of a larger chemicalstructure. Such chemical structure can be selected from the groupconsisting of a monomer, a polymer, a macromolecule, and a supramolecule(also known as supermolecule). As used herein, a “monovalent variant ofa compound” refers to a moiety that is identical to the compound exceptthat one hydrogen has been removed and replaced with a bond to the restof the chemical structure. As used herein, a “polyvalent variant of acompound” refers to a moiety that is identical to the compound exceptthat more than one hydrogen has been removed and replaced with a bond orbonds to the rest of the chemical structure. In the instance of asupramolecule, the inventive compound can also be incorporated into thesupramolecule complex without covalent bonds.

D. Combination of the Compounds of the Present Disclosure with OtherMaterials

The materials described herein as useful for a particular layer in anorganic light emitting device may be used in combination with a widevariety of other materials present in the device. For example, emissivedopants disclosed herein may be used in conjunction with a wide varietyof hosts, transport layers, blocking layers, injection layers,electrodes and other layers that may be present. The materials describedor referred to below are non-limiting examples of materials that may beuseful in combination with the compounds disclosed herein, and one ofskill in the art can readily consult the literature to identify othermaterials that may be useful in combination.

a) Conductivity Dopants:

A charge transport layer can be doped with conductivity dopants tosubstantially alter its density of charge carriers, which will in turnalter its conductivity. The conductivity is increased by generatingcharge carriers in the matrix material, and depending on the type ofdopant, a change in the Fermi level of the semiconductor may also beachieved. Hole-transporting layer can be doped by p-type conductivitydopants and n-type conductivity dopants are used in theelectron-transporting layer.

Non-limiting examples of the conductivity dopants that may be used in anOLED in combination with materials disclosed herein are exemplifiedbelow together with references that disclose those materials:EP01617493, EP01968131, EP2020694, EP2684932, US20050139810,US20070160905, US20090167167, US2010288362, WO06081780, WO2009003455,WO2009008277, WO2009011327, WO2014009310, US2007252140, US2015060804,US20150123047, and US2012146012.

b) HIL/HTL:

A hole injecting/transporting material to be used in the presentdisclosure is not particularly limited, and any compound may be used aslong as the compound is typically used as a hole injecting/transportingmaterial. Examples of the material include, but are not limited to: aphthalocyanine or porphyrin derivative; an aromatic amine derivative; anindolocarbazole derivative; a polymer containing fluorohydrocarbon; apolymer with conductivity dopants; a conducting polymer, such asPEDOT/PSS; a self-assembly monomer derived from compounds such asphosphonic acid and silane derivatives; a metal oxide derivative, suchas MoO_(x); a p-type semiconducting organic compound, such as1,4,5,8,9,12-Hexaazatriphenylenehexacarbonitrile; a metal complex, and across-linkable compounds.

Examples of aromatic amine derivatives used in HIL or HTL include, butnot limit to the following general structures:

Each of Ar¹ to Ar⁹ is selected from the group consisting of aromatichydrocarbon cyclic compounds such as benzene, biphenyl, triphenyl,triphenylene, naphthalene, anthracene, phenalene, phenanthrene,fluorene, pyrene, chrysene, perylene, and azulene; the group consistingof aromatic heterocyclic compounds such as dibenzothiophene,dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran,benzothiophene, benzoselenophene, carbazole, indolocarbazole,pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole,oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole,pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine,oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine,benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline,cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine,pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine,benzofuropyridine, furodipyridine, benzothienopyridine,thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine;and the group consisting of 2 to 10 cyclic structural units which aregroups of the same type or different types selected from the aromatichydrocarbon cyclic group and the aromatic heterocyclic group and arebonded to each other directly or via at least one of oxygen atom,nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom,chain structural unit and the aliphatic cyclic group. Each Ar may beunsubstituted or may be substituted by a substituent selected from thegroup consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl,heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl,cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylicacids, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl,phosphino, and combinations thereof.

In one aspect, Ar¹ to Ar⁹ is independently selected from the groupconsisting of:

wherein k is an integer from 1 to 20; X¹⁰¹ to X¹⁰⁸ is C (including CH)or N; Z¹⁰¹ is NAr¹, O, or S; A¹ has the same group defined above.

Examples of metal complexes used in HIL or HTL include, but are notlimited to the following general formula:

wherein Met is a metal, which can have an atomic weight greater than 40;(Y¹⁰¹−Y¹⁰²) is a bidentate ligand, Y¹⁰¹ and Y¹⁰² are independentlyselected from C, N, O, P, and S; L¹⁰¹ is an ancillary ligand; k′ is aninteger value from 1 to the maximum number of ligands that may beattached to the metal; and k′+k″ is the maximum number of ligands thatmay be attached to the metal.

In one aspect, (Y¹⁰¹−Y¹⁰²) is a 2-phenylpyridine derivative. In anotheraspect, (Y¹⁰¹−Y¹⁰²) is a carbene ligand. In another aspect, Met isselected from Ir, Pt, Os, and Zn. In a further aspect, the metal complexhas a smallest oxidation potential in solution vs. Fc⁺/Fc couple lessthan about 0.6 V.

Non-limiting examples of the HIL and HTL materials that may be used inan OLED in combination with materials disclosed herein are exemplifiedbelow together with references that disclose those materials:CN102702075, DE102012005215, EP01624500, EP01698613, EP01806334,EP01930964, EP01972613, EP01997799, EP02011790, EP02055700, EP02055701,EP1725079, EP2085382, EP2660300, EP650955, JP07-073529, JP2005112765,JP2007091719, JP2008021687, JP2014-009196, KR20110088898, KR20130077473,TW201139402, U.S. Ser. No. 06/517,957, US20020158242, US20030162053,US20050123751, US20060182993, US20060240279, US20070145888,US20070181874, US20070278938, US20080014464, US20080091025,US20080106190, US20080124572, US20080145707, US20080220265,US20080233434, US20080303417, US2008107919, US20090115320,US20090167161, US2009066235, US2011007385, US20110163302, US2011240968,US2011278551, US2012205642, US2013241401, US20140117329, US2014183517,U.S. Pat. Nos. 5,061,569, 5,639,914, WO05075451, WO07125714, WO08023550,WO08023759, WO2009145016, WO2010061824, WO2011075644, WO2012177006,WO2013018530, WO2013039073, WO2013087142, WO2013118812, WO2013120577,WO2013157367, WO2013175747, WO2014002873, WO2014015935, WO2014015937,WO2014030872, WO2014030921, WO2014034791, WO2014104514, WO2014157018.

c) EBL:

An electron blocking layer (EBL) may be used to reduce the number ofelectrons and/or excitons that leave the emissive layer. The presence ofsuch a blocking layer in a device may result in substantially higherefficiencies, and/or longer lifetime, as compared to a similar devicelacking a blocking layer. Also, a blocking layer may be used to confineemission to a desired region of an OLED. In some embodiments, the EBLmaterial has a higher LUMO (closer to the vacuum level) and/or highertriplet energy than the emitter closest to the EBL interface. In someembodiments, the EBL material has a higher LUMO (closer to the vacuumlevel) and/or higher triplet energy than one or more of the hostsclosest to the EBL interface. In one aspect, the compound used in EBLcontains the same molecule or the same functional groups used as one ofthe hosts described below.

d) Hosts:

The light emitting layer of the organic EL device of the presentdisclosure preferably contains at least a metal complex as lightemitting material, and may contain a host material using the metalcomplex as a dopant material. Examples of the host material are notparticularly limited, and any metal complexes or organic compounds maybe used as long as the triplet energy of the host is larger than that ofthe dopant. Any host material may be used with any dopant so long as thetriplet criteria is satisfied.

Examples of metal complexes used as host are preferred to have thefollowing general formula:

wherein Met is a metal; (Y¹⁰³−Y¹⁰⁴) is a bidentate ligand, Y¹⁰³ and Y¹⁰⁴are independently selected from C, N, O, P, and S; L¹⁰¹ is an anotherligand; k′ is an integer value from 1 to the maximum number of ligandsthat may be attached to the metal; and k′+k″ is the maximum number ofligands that may be attached to the metal.

In one aspect, the metal complexes are:

wherein (O—N) is a bidentate ligand, having metal coordinated to atoms Oand N.

In another aspect, Met is selected from Ir and Pt. In a further aspect,(Y¹⁰³−Y¹⁰⁴) is a carbene ligand.

In one aspect, the host compound contains at least one of the followinggroups selected from the group consisting of aromatic hydrocarbon cycliccompounds such as benzene, biphenyl, triphenyl, triphenylene,tetraphenylene, naphthalene, anthracene, phenalene, phenanthrene,fluorene, pyrene, chrysene, perylene, and azulene; the group consistingof aromatic heterocyclic compounds such as dibenzothiophene,dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran,benzothiophene, benzoselenophene, carbazole, indolocarbazole,pyridylindole, pyrrolodipyridine, pyrazole, imidazole, triazole,oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole,pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine,oxathiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine,benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline,cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine,pteridine, xanthene, acridine, phenazine, phenothiazine, phenoxazine,benzofuropyridine, furodipyridine, benzothienopyridine,thienodipyridine, benzoselenophenopyridine, and selenophenodipyridine;and the group consisting of 2 to 10 cyclic structural units which aregroups of the same type or different types selected from the aromatichydrocarbon cyclic group and the aromatic heterocyclic group and arebonded to each other directly or via at least one of oxygen atom,nitrogen atom, sulfur atom, silicon atom, phosphorus atom, boron atom,chain structural unit and the aliphatic cyclic group. Each option withineach group may be unsubstituted or may be substituted by a substituentselected from the group consisting of deuterium, halogen, alkyl,cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carboxylic acids, ether, ester, nitrile, isonitrile,sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

In one aspect, the host compound contains at least one of the followinggroups in the molecule:

wherein R¹⁰¹ is selected from the group consisting of hydrogen,deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof, and when it is aryl or heteroaryl, it has thesimilar definition as Ar's mentioned above. k is an integer from 0 to 20or 1 to 20. X¹⁰¹ to X¹⁰⁸ are independently selected from C (includingCH) or N. Z¹⁰¹ and Z¹⁰² are independently selected from NR¹⁰¹, O, or S.

Non-limiting examples of the host materials that may be used in an OLEDin combination with materials disclosed herein are exemplified belowtogether with references that disclose those materials: EP2034538,EP2034538A, EP2757608, JP2007254297, KR20100079458, KR20120088644,KR20120129733, KR20130115564, TW201329200, US20030175553, US20050238919,US20060280965, US20090017330, US20090030202, US20090167162,US20090302743, US20090309488, US20100012931, US20100084966,US20100187984, US2010187984, US2012075273, US2012126221, US2013009543,US2013105787, US2013175519, US2014001446, US20140183503, US20140225088,US2014034914, U.S. Pat. No. 7,154,114, WO2001039234, WO2004093207,WO2005014551, WO2005089025, WO2006072002, WO2006114966, WO2007063754,WO2008056746, WO2009003898, WO2009021126, WO2009063833, WO2009066778,WO2009066779, WO2009086028, WO2010056066, WO2010107244, WO2011081423,WO2011081431, WO2011086863, WO2012128298, WO2012133644, WO2012133649,WO2013024872, WO2013035275, WO2013081315, WO2013191404, WO2014142472,US20170263869, US20160163995, U.S. Pat. No. 9,466,803,

e) Additional Emitters:

One or more additional emitter dopants may be used in conjunction withthe compound of the present disclosure. Examples of the additionalemitter dopants are not particularly limited, and any compounds may beused as long as the compounds are typically used as emitter materials.Examples of suitable emitter materials include, but are not limited to,compounds which can produce emissions via phosphorescence, fluorescence,thermally activated delayed fluorescence, i.e., TADF (also referred toas E-type delayed fluorescence), triplet-triplet annihilation, orcombinations of these processes.

Non-limiting examples of the emitter materials that may be used in anOLED in combination with materials disclosed herein are exemplifiedbelow together with references that disclose those materials:CN103694277, CN1696137, EB01238981, EP01239526, EP01961743, EP1239526,EP1244155, EP1642951, EP1647554, EP1841834, EP1841834B, EP2062907,EP2730583, JP2012074444, JP2013110263, JP4478555, KR1020090133652,KR20120032054, KR20130043460, TW201332980, U.S. Ser. Nos. 06/699,599,06/916,554, US20010019782, US20020034656, US20030068526, US20030072964,US20030138657, US20050123788, US20050244673, US2005123791, US2005260449,US20060008670, US20060065890, US20060127696, US20060134459,US20060134462, US20060202194, US20060251923, US20070034863,US20070087321, US20070103060, US20070111026, US20070190359,US20070231600, US2007034863, US2007104979, US2007104980, US2007138437,US2007224450, US2007278936, US20080020237, US20080233410, US20080261076,US20080297033, US200805851, US2008161567, US2008210930, US20090039776,US20090108737, US20090115322, US20090179555, US2009085476, US2009104472,US20100090591, US20100148663, US20100244004, US20100295032,US2010102716, US2010105902, US2010244004, US2010270916, US20110057559,US20110108822, US20110204333, US2011215710, US2011227049, US2011285275,US2012292601, US20130146848, US2013033172, US2013165653, US2013181190,US2013334521, US20140246656, US2014103305, U.S. Pat. Nos. 6,303,238,6,413,656, 6,653,654, 6,670,645, U.S. Pat. Nos. 6,687,266, 6,835,469,6,921,915, 7,279,704, 7,332,232, 7,378,162, 7,534,505, 7,675,228,7,728,137, 7,740,957, 7,759,489, 7,951,947, 8,067,099, 8,592,586,8,871,361, WO06081973, WO06121811, WO07018067, WO07108362, WO07115970,WO07115981, WO08035571, WO2002015645, WO2003040257, WO2005019373,WO2006056418, WO2008054584, WO2008078800, WO2008096609, WO2008101842,WO2009000673, WO2009050281, WO2009100991, WO2010028151, WO2010054731,WO2010086089, WO2010118029, WO2011044988, WO2011051404, WO2011107491,WO2012020327, WO2012163471, WO2013094620, WO2013107487, WO2013174471,WO2014007565, WO2014008982, WO2014023377, WO2014024131, WO2014031977,WO2014038456, WO2014112450.

f) HBL:

A hole blocking layer (HBL) may be used to reduce the number of holesand/or excitons that leave the emissive layer. The presence of such ablocking layer in a device may result in substantially higherefficiencies and/or longer lifetime as compared to a similar devicelacking a blocking layer. Also, a blocking layer may be used to confineemission to a desired region of an OLED. In some embodiments, the HBLmaterial has a lower HOMO (further from the vacuum level) and/or highertriplet energy than the emitter closest to the HBL interface. In someembodiments, the HBL material has a lower HOMO (further from the vacuumlevel) and/or higher triplet energy than one or more of the hostsclosest to the HBL interface.

In one aspect, compound used in HBL contains the same molecule or thesame functional groups used as host described above.

In another aspect, compound used in HBL contains at least one of thefollowing groups in the molecule:

wherein k is an integer from 1 to 20; L¹⁰¹ is another ligand, k′ is aninteger from 1 to 3.

g) ETL:

Electron transport layer (ETL) may include a material capable oftransporting electrons. Electron transport layer may be intrinsic(undoped), or doped. Doping may be used to enhance conductivity.Examples of the ETL material are not particularly limited, and any metalcomplexes or organic compounds may be used as long as they are typicallyused to transport electrons.

In one aspect, compound used in ETL contains at least one of thefollowing groups in the molecule:

wherein R¹⁰¹ is selected from the group consisting of hydrogen,deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acids, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof, when it is aryl or heteroaryl, it has the similardefinition as Ar's mentioned above. Ar¹ to A³ has the similar definitionas Ar's mentioned above. k is an integer from 1 to 20. X¹⁰¹ to X¹⁰⁸ isselected from C (including CH) or N.

In another aspect, the metal complexes used in ETL contains, but notlimit to the following general formula:

wherein (O—N) or (N—N) is a bidentate ligand, having metal coordinatedto atoms O, N or N, N; L¹⁰¹ is another ligand; k′ is an integer valuefrom 1 to the maximum number of ligands that may be attached to themetal.

Non-limiting examples of the ETL materials that may be used in an OLEDin combination with materials disclosed herein are exemplified belowtogether with references that disclose those materials: CN103508940,EP01602648, EP01734038, EP01956007, JP2004-022334, JP2005149918,JP2005-268199, KR0117693, KR20130108183, US20040036077, US20070104977,US2007018155, US20090101870, US20090115316, US20090140637,US20090179554, US2009218940, US2010108990, US2011156017, US2011210320,US2012193612, US2012214993, US2014014925, US2014014927, US20140284580,U.S. Pat. Nos. 6,656,612, 8,415,031, WO2003060956, WO2007111263,WO2009148269, WO2010067894, WO2010072300, WO2011074770, WO2011105373,WO2013079217, WO2013145667, WO2013180376, WO2014104499, WO2014104535,

h) Charge Generation Layer (CGL)

In tandem or stacked OLEDs, the CGL plays an essential role in theperformance, which is composed of an n-doped layer and a p-doped layerfor injection of electrons and holes, respectively. Electrons and holesare supplied from the CGL and electrodes. The consumed electrons andholes in the CGL are refilled by the electrons and holes injected fromthe cathode and anode, respectively; then, the bipolar currents reach asteady state gradually. Typical CGL materials include n and pconductivity dopants used in the transport layers.

In any above-mentioned compounds used in each layer of the OLED device,the hydrogen atoms can be partially or fully deuterated. Thus, anyspecifically listed substituent, such as, without limitation, methyl,phenyl, pyridyl, etc. may be undeuterated, partially deuterated, andfully deuterated versions thereof. Similarly, classes of substituentssuch as, without limitation, alkyl, aryl, cycloalkyl, heteroaryl, etc.also may be undeuterated, partially deuterated, and fully deuteratedversions thereof.

It is understood that the various embodiments described herein are byway of example only and are not intended to limit the scope of theinvention. For example, many of the materials and structures describedherein may be substituted with other materials and structures withoutdeviating from the spirit of the invention. The present invention asclaimed may therefore include variations from the particular examplesand preferred embodiments described herein, as will be apparent to oneof skill in the art. It is understood that various theories as to whythe invention works are not intended to be limiting.

Experimental

Synthesis of Compound I″-[(R₁₂)(R²⁹)(R²⁹)]

Synthesis of N1,N2-di(pyridin-2-yl)benzene-1,2-diamine: A mixture ofbenzene-1,2-diamine (3 g, 27.7 mmol) and 2-chloropyridine (5.77 ml, 61.0mmol) was heated at 160° C. for 16 h. Dissolved everything by addingwater and DCM. Basified the solution with Na₂CO₃ until basic andextracted with DCM. After evaporation, the product was triturated inMeOH and filtered and dried in the vacuum oven (67% yield).

Synthesis of Compound I″-[(R¹²)(R²⁹)(R²⁹)]: A mixture ofN1,N2-di(pyridin-2-yl)benzene-1,2-diamine (337 mg, 1.285 mmol) and[1,1′:3′,1″-terphenyl]-2′-ylboronic acid (352 mg, 1.285 mmol) was vacuumand back-filled nitrogen. Toluene (20 ml) was added and refluxed using aDeak-Stark trap for 5 days. Cooled down and coated on celite andchromatographed on silica (EA/Hep=1/2). The product was triturated inheptane and filtered and dried in the vacuum oven (50% yield).

TABLE 1 Photophysical properties of Compound I″-[(R¹²)(R²⁹)(R²⁹)]Compound Structure T1 (nm) HOMO (eV) LUMO (eV) Compound I″-[(R¹²)(R²⁹)(R²⁹)]

410 −5.68 −1.83

Table 1 shows T₁, HOMO, and LUMO of the inventive CompoundI″-[(R¹²)(R²⁹)(R²⁹)]. The inventive compound has a T₁ and LUMO similarto that of the most commonly used host piece, carbazole. This can be agood alternative to carbazole given that it contains heterocyclic ringsto potentially help electron transport.

OLED Device Fabrication:

OLEDs were grown on a glass substrate pre-coated with anindium-tin-oxide (ITO) layer having a sheet resistance of 15-Ω/sq. Priorto any organic layer deposition or coating, the substrate was degreasedwith solvents and then treated with an oxygen plasma for 1.5 minuteswith 50 W at 100 mTorr and with UV ozone for 5 minutes.

The devices were fabricated in high vacuum (<10⁻⁶ Torr) by thermalevaporation. The anode electrode was 750 Å of indium tin oxide (ITO).The device example had organic layers consisting of, sequentially, fromthe ITO surface, 100 Å of Compound 1 (HIL), 250 Å of Compound 2 (HTL),50 Å of Compound 3 (EBL), 300 Å of emitting layer, (EML) and,optionally, 5% of Compound I″-[(R¹²)(R²⁹)(R²⁹)] as a co-host, 50 Å ofCompound 5 (BL), 300 Å of Compound 6 doped with 35% of Compound 7 (ETL),10 Å of Compound 6 (EIL) followed by 1,000 Å of Al (Cathode). In theinventive device, the EML consists of 5% of inventive CompoundI″-[(R¹²)(R²⁹)(R²⁹)], 75% of Compound 4, and 20% of Emitter 1. In thecomparative device, the EML has the same components except the inventiveCompound. All devices were encapsulated with a glass lid sealed with anepoxy resin in a nitrogen glove box (<1 ppm of H₂O and O₂) immediatelyafter fabrication with a moisture getter incorporated inside thepackage. Doping percentages are in volume percent. The compounds used inthe devices are shown below, and the device results are shown in Table2.

TABLE 2 Device data at 1,000 nit 1931 CIE λ max FWHM Voltage EQE Devicex y [nm] [nm] [V] [%] Inventive Device 0.174 0.389 474 58 0.86 1.03Comparative Device 0.181 0.410 475 61 1.00 1.00

As can be seen here, by using the inventive CompoundI″-[(R¹²)(R²⁹)(R₂₉)] as an electron transporting co-host in the emissivelayer, the device shows a significant decreased working voltage and anenhanced EQE. It can also improve the color purity and reduce the FWHMfrom 61 nm to 58 nm, which is a vital parameter for display applicationand often is very difficult to reduce. Without being bound by anytheories, this is probably due to the enhanced electron transportcapability of the inventive compound.

What is claimed is:
 1. A compound having the structure of Formula I:

wherein: A is a monocyclic or multicyclic ring system comprising one ormore fused or unfused 5-membered or 6-membered carbocyclic orheterocyclic rings which can be further substituted; each Rindependently has a structure of Formula II:

R is fused to two consecutive carbon atoms in A through the dashedlines; Z¹ and Z² are each independently selected from the groupconsisting of O, S, Se, and NAr⁵; Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ are eachindependently a 5-membered or 6-membered carbocyclic or heterocyclicring which can be further substituted; index n is 0, 1, or 2 with theproviso that when 1) Z¹ is NAr⁵, and 2) Ar¹, Ar² and Ar⁵ are all6-membered carbocyclic rings, then n is 1 or 2; or when Z¹ is O, the nis 1 or 2; and any two adjacent Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ can bejoined or fused to form a ring.
 2. The compound of claim 1, wherein A isa 6-membered aromatic ring.
 3. The compound of claim 1, wherein Acomprises at least two fused rings.
 4. The compound of claim 1, whereinA comprises one or more substituent selected from the group consistingof deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino,boryl, and combinations thereof.
 5. The compound of claim 1, whereineach ring in A is a 6-membered ring.
 6. The compound of claim 1, whereinAr¹ and Ar² are each independently 6-membered aromatic rings; Ar³ andAr⁴ are each independently 6-membered aromatic rings; or Ar⁵ is a6-membered aromatic ring.
 7. The compound of claim 1, wherein thecompound is selected from the group consisting of:

wherein R^(1′), R^(2′), R^(3′), R^(4′) and R^(5′) are each independentlyselected from the group consisting of deuterium, halogen, alkyl,cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile,sulfanyl, sulfinyl, sulfonyl, phosphino, boryl, and combinationsthereof.
 8. The compound of claim 1, wherein the compound is selectedfrom the group consisting of: Compound name Structure CompoundI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is an integer from 1to 65 and j, k, l, m are independently an integer from 1 to 60

Compound II-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound III-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound IV-[(R^(i))(R^(j))(R^(k))], wherein i is an integer from 1 to65 and j and k are independently an integer from 1 to 60

Compound V-[(R^(i))(R^(j))(R^(k))], wherein i is an integer from 1 to 65and j and k are independently an integer from 1 to 60

Compound VI-[(R^(i))(R^(j))(R^(k))], wherein i is an integer from 1 to65 and j and k are independently an integer from 1 to 60

Compound VII-[(R^(i))(R^(j))(R^(k))], wherein i is an integer from 1 to65 and j and k are independently an integer from 1 to 60

Compound VIII-[(R^(i))(R^(j))(R^(k))(R^(l))], wherein i is an integerfrom 1 to 65 and j, k, l are independently an integer from 1 to 60

Compound IX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound X-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XIII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XIV-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XV-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XVI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XVII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XVIII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XIX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XX-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XXI-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

Compound XXII-[(R^(i))(R^(j))(R^(k))(R^(l))(R^(m))], wherein i is aninteger from 1 to 65 and j, k, l, m are independently an integer from 1to 60

where R¹ to R⁶⁵ have the following structures:


9. The compound of claim 1, wherein the compound is selected from thegroup consisting of:

wherein R⁶⁶ is selected from the group consisting of

and R⁶⁷ is S or O.
 10. A compound having the structure of Formula III:

wherein each X may be the same or different and is C or N; D is amonocyclic or multicyclic ring system comprising one or more fused orunfused 5-membered or 6-membered carbocyclic or heterocyclic rings whichcan be further substituted; R′ comprise a structure of Formula IV:

each X′ may be the same or different and is C or N; R′ is joined to acarbon atom in D through the dashed line; Z³ and Z⁴ are eachindependently selected from the group consisting of O, S, Se, and NAr⁸;R^(A) and R^(B) each independently represent zero, mono to the maximumallowable substitution; each R^(A) and R^(B) is independently a hydrogenor a substituent selected from the group consisting of deuterium,halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof; Ar⁶, Ar⁷, and Ar⁸ are each independently a5-membered or 6-membered carbocyclic or heterocyclic ring which can befurther substituted; index m is 1 or 2; and any two adjacent A, Ar¹,Ar², Ar³, Ar⁴, and Ar⁵ can be joined or fused to form a ring.
 11. Thecompound of Formula 10, wherein each R^(A) and R^(B) independently ahydrogen or a substituent selected from the group consisting ofdeuterium, fluorine, alkyl, cycloalkyl, heteroalkyl, boryl, alkoxy,aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, aryl,heteroaryl, nitrile, isonitrile, sulfanyl, and combinations thereof. 12.The compound of claim 10, wherein each X and X′ is C.
 13. The compoundof claim 10, wherein D comprises a single ring.
 14. The compound ofclaim 10, wherein D comprises at least two fused rings.
 15. The compoundof claim 10, wherein the compound is selected from the group consistingof:

wherein R^(1″), R^(2″), R^(3″), R^(4″), R^(5″) and R^(6″) are eachindependently selected from the group consisting of deuterium, halogen,alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy,aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl,aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile,isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, boryl, andcombinations thereof.
 16. The compound of claim 10, wherein the compoundis selected from the group consisting of: Compound name StructureCompound I′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound II′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound III′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound IV′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound V′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound VI′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound VII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound VIII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′,l′ are independently an integer from 1 to 60

Compound IX′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound X′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XI′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XIII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′,l′ are independently an integer from 1 to 60

Compound XIV′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XV′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XVI′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′, l′are independently an integer from 1 to 60

Compound XVII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′,l′ are independently an integer from 1 to 60

Compound XVIII′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)], wherein i′, j′, k′,l′ are independently an integer from 1 to 60

Compound XIX′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)(R^(m)′)(R^(n)′)],wherein i′, j′, k′, l′, m′, n′ are independently an integer from 1 to 60

Compound XX′-[(R^(i)′)(R^(j)′)(R^(k)′)(R^(l)′)(R^(m)′)(R^(n)′)], whereini′, j′, k′, l′, m′, n′ are independently an integer from 1 to 60


17. The compound of claim 10, wherein the compound is selected from thegroup consisting of

wherein R⁶⁷ is S or O, and R⁶⁸ is selected from the group consisting of


18. An organic light emitting device (OLED) comprising: an anode; acathode; and an organic layer disposed between the anode and thecathode, wherein the organic layer comprises a compound selected fromthe group consisting of Formula I and Formula III; wherein Formula I hasthe structure:

A is a monocyclic or multicyclic ring system comprising one or morefused or unfused 5-membered or 6-membered carbocyclic or heterocyclicrings which can be further substituted; each R independently has astructure of Formula II:

R is fused to two consecutive carbon atoms in A through the dashedlines; Z¹ and Z² are each independently selected from the groupconsisting of O, S, Se, and NAr⁵; Ar², Ar^(a), Ar⁴, and Ar⁵ are eachindependently a 5-membered or 6-membered carbocyclic or heterocyclicring which can be further substituted; index n is 0, 1, or 2 with theproviso that when 1) Z¹ is NAr⁵, and 2) A¹, Ar² and Ar⁵ are all6-membered carbocyclic rings, then p is 1 or 2; or when Z¹ is O, the nis 1 or 2; and any two adjacent A, Ar¹, Ar², Ar³, Ar⁴, and Ar⁵ can bejoined or fused to form a ring; wherein Formula III has the structure:

each X may be the same or different and is C or N; D is a monocyclic ormulticyclic ring system comprising one or more fused or unfused5-membered or 6-membered carbocyclic or heterocyclic rings which can befurther substituted; R′ comprise a structure of Formula IV:

each X′ may be the same or different and is C or N; R′ is joined to acarbon atom in D through the dashed line; Z³ and Z⁴ are eachindependently selected from the group consisting of O, S, Se, and NAr⁸;R^(A) and R^(B) each independently represent zero, mono to the maximumallowable substitution; each R^(A) and R^(B) is independently a hydrogenor a substituent selected from the group consisting of deuterium,halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, boryl,arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl,heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether,ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, andcombinations thereof; Ar⁶, Ar⁷, and Ar⁸ are each independently a5-membered or 6-membered carbocyclic or heterocyclic ring which can befurther substituted; index m is 1 or 2; and any two adjacent A, Ar¹,Ar², Ar³, Ar⁴, and Ar⁵ can be joined or fused to form a ring
 19. TheOLED of claim 18, wherein the compound is a host, and the organic layeris an emissive layer that comprises a phosphorescent emitter; whereinthe phosphorescent emitter is a transition metal complex having at leastone ligand or part of the ligand if the ligand is more than bidentateselected from the group consisting of:

wherein: T is selected from the group consisting of B, Al, Ga, and In;each Y¹ to Y¹³ are independently selected from the group consisting ofcarbon and nitrogen; Y′ is selected from the group consisting of BR_(e), N R_(e), P R_(e), O, S, Se, C═O, S═O, SO₂, CR_(e)R_(f),SiR_(e)R_(f), and GeR_(e)R_(f); R_(e) and R_(f) can be fused or joinedto form a ring; each R_(a), R_(b), R_(e), and R_(d) independentlyrepresent zero, mono, or up to a maximum allowed substitution to itsassociated ring; each of R_(a), R_(b), R_(e), R_(d), R_(e) and R_(f) isindependently selected from the group consisting of hydrogen, deuterium,halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy,amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl,heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile,sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; andtwo adjacent substituents of R_(a), R_(b), R_(e), and R_(d) can be fusedor joined to form a ring or form a multidentate ligand.
 20. The OLED ofclaim 18, wherein the compound is functioning in the organic layer as acomponent selected from the group consisting of a fluorescent emitter, adelayed fluorescence emitter, a component of an exciplex that is afluorescent emitter or a delayed fluorescence emitter; an acceptor, anda sensitizer